<template lang="html">
  <div class="">
    <div class="shopcart">
      <div class="content" @click="listShow">
        <div class="left-content">
          <div class="logo-wrapper">
            <div class="logo" :class="{'highlight': totalCount > 0}">
              <i class="icon-shopping_cart"></i>
            </div>
            <div v-show="totalCount > 0" class="num">{{totalCount}}</div>
          </div>
          <div class="price" :class="{'highlight': totalCount > 0}">￥{{totalPrice}}</div>
          <div class="desc">另需配送费￥{{deliveryPrice}}元</div>
        </div>
        <div class="right-content" @click.stop.prevent="pay">
          <div class="pay" :class="payClass">
            {{payDesc}}
          </div>
        </div>
      </div>
      <div class="ball-container">
        <transition-group name="drop" @before-enter="beforeEnter" @enter="enter" @after-enter="afterEnter">
          <div v-for="(ball, index) in balls" :key="index" v-show="ball.show" class="ball">
            <div class="inner inner-hook"></div>
          </div>
        </transition-group>
      </div>
      <transition name="fold">
        <div class="shopcart-list" v-show="fold">
          <div class="list-header">
            <h1 class="title">购物车</h1>
            <span class="emity" @click="emity">清空</span>
          </div>
          <div class="list-content" ref="listContent">
            <ul>
              <li class="food border-1px" v-for="food in selectFoods" :key="food.index">
                <span class="name">{{food.name}}</span>
                <div class="price">
                  ￥<span class="text">{{food.price * food.count}}</span>
                </div>
                <div class="cartcontrol-wrapper">
                  <cartcontrol :food="food"></cartcontrol>
                </div>
              </li>
            </ul>
          </div>
        </div>
      </transition>
    </div>
    <transition name="fade">
      <div class="list-mask" v-show="fold" @click="listShow"></div>
    </transition>
  </div>
</template>

<script type="text/ecmascript0-6">
import BScroll from 'better-scroll';
import cartcontrol from '@/components/cartcontrol/cartcontrol.vue';

export default {
  name: 'shopcart',
  props: {
    selectFoods: {
      type: Array,
      default() {
        return [];
      }
    },
    minPrice: {
      type: Number,
      default: 0
    },
    deliveryPrice: {
      type: Number,
      default: 0
    }
  },
  components: {
    cartcontrol
  },
  data() {
    return {
      balls: [{
        show: false
      },
      {
        show: false
      },
      {
        show: false
      },
      {
        show: false
      },
      {
        show: false
      }],
      dropBalls: [],
      fold: false
    };
  },
  computed: {
    totalPrice() {
      let count = 0;
      this.selectFoods.forEach((food) => {
        count += food.count * food.price;
      });
      return count;
    },
    totalCount() {
      let total = 0;
      this.selectFoods.forEach((food) => {
        total += food.count;
      });
      return total;
    },
    payDesc() {
      if (this.totalPrice === 0) {
        return `￥${this.minPrice}起送`;
      } else if (this.totalPrice < this.minPrice) {
        let buff = this.minPrice - this.totalPrice;
        return `还差￥${buff}起送`;
      } else {
        return '去结算';
      }
    },
    payClass() {
      if (this.totalPrice < this.minPrice) {
        return 'not-enough';
      } else {
        return 'enough';
      }
    }
  },
  methods: {
    drop(el) {
      for (let i = 0; i < this.balls.length; i++) {
        let ball = this.balls[i];
        if (!ball.show) {
          ball.show = true;
          ball.el = el;
          this.dropBalls.push(ball);
          return;
        }
      }

      for (let i = 0; i < this.balls.length; i++) {
        let ball = this.balls[i];
        if (!ball.show) {
          ball.show = true;
          ball.el = el;
          this.dropBalls.push(ball);
          return;
        }
      }
    },
    beforeEnter(el) {
      let count = this.balls.length;
      while (count--) {
        let ball = this.balls[count];
        if (ball.show) {
          let rect = ball.el.getBoundingClientRect();
          let x = rect.left - 32;
          let y = -(window.innerHeight - rect.top - 22);
          el.style.display = '';
          el.style.webkitTransform = `translate3d(0, ${y}px, 0)`;
          el.style.transform = `translate3d(0, ${y}px, 0)`;
          let inner = el.getElementsByClassName('inner-hook')[0];
          inner.style.webkitTransform = `translate3d(${x}px, 0, 0)`;
          inner.style.transform = `translate3d(${x}px, 0, 0)`;
        }
      }
    },
    enter(el) {
      /* eslint-disable no-unused-vars */
      let rf = el.offsetHeight;
      this.$nextTick(() => {
        el.style.webkitTransform = 'translate3d(0, 0, 0)';
        el.style.transform = 'translate3d(0, 0, 0)';
        let inner = el.getElementsByClassName('inner-hook')[0];
        inner.style.webkitTransform = 'translate3d(0, 0, 0)';
        inner.style.transform = 'translate3d(0, 0, 0)';
      });
    },
    afterEnter(el) {
      let ball = this.dropBalls.shift();
      if (ball) {
        ball.show = false;
        el.style.display = 'none';
      }
    },
    pay() {
      if (this.totalPrice < this.minPrice) {
        return;
      }
      window.alert(`结算${this.totalPrice}元`);
    },
    listShow() {
      this.fold = !this.fold;
      this.$nextTick(() => {
        if (!this.scroll) {
            this.scroll = new BScroll(this.$refs.listContent, {
              click: true
            });
        } else {
          this.scroll.refresh();
        }
      });
      return this.fold;
    },
    emity() {
      this.selectFoods.forEach((food) => {
        food.count = 0;
      });
    }
  },
  watch: {
    totalCount: function () {
      if (!this.totalCount) {
        this.fold = false;
      }
    },
    fold: function () {
      if (!this.totalCount) {
        this.scroll.refresh();
        this.fold = false;
      }
    }
  }
};
</script>

<style lang="stylus" rel="stylesheet/stylus">
  @import '../../common/stylus/mixin.styl';

  .shopcart
    position: fixed
    bottom: 0
    left: 0
    width: 100%
    height: 48px
    z-index: 50
    .content
      display: flex
      font-size: 0
      color: rgba(255, 255, 255, .4)
      background: #141d27
      .left-content
        flex: 1
        .logo-wrapper
          display: inline-block
          position: relative
          top: -10px
          padding: 6px
          margin: 0 12px
          width: 56px
          height: 56px
          vertical-align: top
          box-sizing: border-box
          border-radius: 50%
          background: #141b27
          .logo
            width: 100%
            height: 100%
            border-radius: 50%
            text-align: center
            background: #2b343c
            &.highlight
              background: rgb(0, 160, 220)
              .icon-shopping_cart
                color: #fff
            .icon-shopping_cart
              line-height: 44px
              font-size: 24px
              color: #80858a
          .num
            position: absolute
            top: 0
            right: 0
            width: 24px
            height: 16px
            line-height: 16px
            border-radius: 16px
            text-align: center
            font-size: 9px
            font-weight: 700
            color: #fff
            box-shadow: 0 4px 8px 0 rgba(0, 0, 0, .4)
            background: rgb(240, 20, 20)
        .price
          display: inline-block
          vertical-align: top
          margin-top: 12px
          padding-right: 12px
          line-height: 24px
          border-sizing: border-box
          border-right: 1px solid rgba(255, 255, 255, .1)
          font-size: 24px
          font-weight: 700
          &.highlight
            color: #fff
        .desc
          display: inline-block
          vertical-align: top
          margin: 12px 0 0 12px
          line-height: 24px
          font-size: 12px
      .right-content
        flex: 0 0 105px
        width: 105px
        .pay
          height: 48px
          line-height: 48px
          text-align: center
          font-size: 12px
          font-weight: 700
          &.not-enough
            background: #2b333b
          &.enough
            background: #00bc3c
            color: #fff
    .ball-container
      .ball
        position: absolute
        left: 32px
        bottom: 22px
        z-index: 200
        &.drop-enter-active, &.drop-leave-active
          transition: all .4s cubic-bezier(.49, -.29, .75, .41)
          .inner
            width: 16px
            height: 16px
            border-radius: 50%
            background: rgb(0, 160, 220)
            transition: all .4s linear
    .shopcart-list
      position: absolute
      top: 0
      left: 0
      width: 100%
      z-index: -1
      transform: translate3d(0, -100%, 0)
      &.fold-enter-active, &.fold.leave-active
        transition: all .5s
        transform: translate3d(0, -100%, 0)
      &.fold-enter, &.fold.leave-active
        transform: translate3d(0, 0, 0)
      .list-header
        width: 100%
        height: 40px
        padding: 0 18px
        box-sizing: border-box
        line-height: 40px
        border-bottom: 1px solid rgba(7, 7, 27, .1)
        background: #f3f5f7
        .title
          float: left
          font-size: 14px
          color: rgb(7, 17, 27)
        .emity
          float: right
          font-size: 12px
          color: rgb(0, 160, 220)
      .list-content
        padding: 0 18px
        max-height: 217px
        overflow: hidden
        background: #fff
        .food
          position: relative
          padding: 12px 0
          box-sizing: border-box
          border-1px(rgba(7, 17, 27, .1))
          &:last-child
            border-none()
          .name
            line-height: 24px
            font-size: 14px
            color: rgb(7, 17, 27)
          .price
            position: absolute
            right: 84px
            top: 12px
            line-height: 24px
            font-size: 10px
            font-weight: 700
            color: rgb(240, 20, 20)
            .text
              font-size: 14px
              font-weight: 700
          .cartcontrol-wrapper
            position: absolute
            right: 0
            top: 12px
  .list-mask
    position: fixed
    top: 0
    left: 0
    width: 100%
    height: 100%
    z-index: 30
    background: rgba(7, 17, 27, .6)
    backdrop-filter: blur(10px)
    &.fade-enter-active, &.fade-leave-active
      transition: all .5s
      opacity: 1
    &.fade-enter, &.fade-leave-active
      opacity: 0
</style>
